JP2019035679A - Charging rate calculation device - Google Patents

Abstract

To keep a calculation accuracy of a charging rate even in a vehicle having a small number of external charging opportunities.SOLUTION: A charging rate calculation device 80 calculates a charging rate of a battery 50 for sending/receiving electric power from a motor 23. A current sensor 54 detects the current input/output to the battery 50. A first electric power calculation unit 82 calculates a first electric power amount input/output to the battery 50. A second electric power calculation unit 84 calculates a second electric power amount input/output to the motor 23 on the basis of an operation state of the motor 23. An abnormality determination unit 88 determines whether the charging rate is abnormal on the basis of the comparison result between a first electric power amount and a second electric power amount.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a charging rate calculation device that calculates a charging rate of a battery.

Conventionally, in an electric vehicle or the like that travels by driving a motor using electric power stored in a battery, a state of charge (SOC) of the driving battery is calculated and used for control.
For example, in the following Patent Document 1, it is determined based on the vehicle state and the battery state whether the remaining battery charge is calculated by a large-scale calculation or a simple calculation. When the risk of battery overdischarge and overcharge is small, the power consumption in the battery management device can be reduced by calculating the remaining battery level with a simple calculation, and the risk of battery overdischarge and overcharge Is large, it is described that the battery remaining amount is accurately calculated by large-scale calculation to suppress the deterioration of the battery.

JP 2017-3286

As described above, in an electric vehicle, control based on the charging rate of the battery is performed, and it is important whether the calculated charging rate is accurate. If the calculated charging rate is not, for example, overcharge or overdischarge may occur, and the vehicle may stop traveling.
Conventionally, the charging rate is calculated using an integrated value of input / output power from the battery and an open circuit voltage (OCV) during external charging. More specifically, while the vehicle is running, the charging rate is calculated by integrating the input / output power from the battery, and at the time of external charging, the charging rate is calculated from the open circuit voltage and the values are compared to calculate the charging rate. Error correction and failure detection of various devices (for example, failure of sensors or ECUs attached to the battery).
However, in some electric vehicles, especially vehicles equipped with a power generation engine, the frequency of external charging is reduced, so even if the charging rate calculated based on the input / output power from the battery is incorrect, There exists a subject that the frequency which can be detected becomes low.
The present invention has been made in view of such circumstances, and an object thereof is to maintain the calculation accuracy of the charging rate even in a vehicle with few opportunities for external charging.

In order to achieve the above object, a charging rate calculation apparatus according to claim 1 is a charging rate calculation apparatus that calculates a charging rate of a battery that exchanges power with a first rotating electrical machine mounted on a vehicle. A current detection unit for detecting a current input / output to / from the battery, and a first power calculation unit for calculating a first power amount input / output to / from the battery based on the current detected by the current detection unit A second power calculator that calculates a second power amount input / output from the first rotating electrical machine based on an operating state of the first rotating electrical machine, the first power amount, and the first power And an abnormality determining unit that determines whether or not the charging rate is abnormal based on a comparison result with the amount of electric power of 2.
According to a second aspect of the present invention, the battery and the first rotating electrical machine are connected to a second rotating electrical machine that is driven by an engine and generates electric power, and the second power calculation unit. Is characterized in that the second electric energy is calculated from the sum of the electric energy input / output to / from the first rotating electric machine and the electric energy input / output from the second rotating electric machine.
According to a third aspect of the present invention, in the charging rate calculation device, the first rotating electrical machine is a motor that drives a driving wheel of the vehicle, and the first power calculation unit is configured to output the output voltage of the battery at a predetermined time. And the output current of the battery at the predetermined time is integrated for a predetermined period to calculate the first electric energy, and the second power calculation unit outputs the output of the motor at the predetermined time. The product of the torque, the rotational speed of the motor at the predetermined time and the predetermined coefficient, the output torque of the second rotating electrical machine at the predetermined time, and the rotational speed of the second rotating electrical machine at the predetermined time The second power amount is calculated by integrating the sum of the product with the coefficient for the predetermined period.
According to a fourth aspect of the present invention, there is provided the charging rate calculation apparatus, wherein the abnormality determination unit is configured such that when at least one of the first power amount and the second power amount is equal to or greater than a predetermined power value, A difference between the power amount and the second power amount is calculated, and when the difference is determined to be equal to or greater than a predetermined power value, it is determined that the charging rate is abnormal.
According to a fifth aspect of the present invention, there is provided the charging rate calculation apparatus, wherein the abnormality determination unit includes the current detection unit when the first power amount becomes equal to or higher than the predetermined power value before the second power amount. It is characterized by determining that there is an abnormality.
According to a sixth aspect of the present invention, there is provided the charging rate calculation apparatus, wherein the abnormality determination unit integrates from the reference time while the second power amount integrated from a predetermined reference time is equal to or greater than a predetermined integration value. When the first electric energy is 0 or a value close to 0, it is determined that the charging rate is abnormal.

According to the first aspect of the present invention, it is determined whether or not there is an abnormality in the charging rate based on a comparison between the amount of power input / output to / from the battery and the amount of power input / output to / from the first rotating electrical machine. . Thereby, for example, even if there is no opportunity to obtain a charge rate to be compared with a charge rate calculated based on input / output of power to the battery, it is determined whether there is an abnormality in the charge rate. be able to.
According to the invention of claim 2, even when two rotating electric machines, that is, a motor and a generator are connected to the battery, it is possible to determine whether there is an abnormality in the charging rate.
According to the invention of claim 3, the integrated value of the electric energy in an arbitrary period can be used as the electric energy for determination.
According to the invention of claim 4, since the calculation of the electric energy is continued until at least one of the first electric energy and the second electric energy becomes equal to or higher than the predetermined electric power value, an error included in the electric energy calculation parameter Can be averaged, which is advantageous in improving the accuracy of abnormality determination.
According to invention of Claim 5, a failure location can be pinpointed by a simple method.
According to the sixth aspect of the present invention, it is possible to determine whether there is an abnormality in the charging rate in a short time without waiting for the second power amount to become equal to or greater than the predetermined power value.

It is a figure which shows the structure of the vehicle 10 by which a charging rate calculation apparatus is mounted. 3 is a block diagram showing a functional configuration of a charging rate calculation device 80. FIG. 5 is a flowchart showing a processing procedure of a charging rate calculation device 80.

Exemplary embodiments of a charging rate calculation apparatus according to the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a diagram illustrating a configuration of a vehicle 10 on which a charging rate calculation device is mounted.
The vehicle 10 is a hybrid vehicle including a motor 23 and an engine 25. The vehicle 10 includes a traveling system 20, a power generation system 30, a fuel tank 40, a battery 50, and an ECU 70.

  The traveling system 20 is a drive mechanism of the vehicle 10, and the front wheel 21 and the rear wheel 22, the motor 23, the inverter 24, the engine 25, the rotation of the output shaft 23 </ b> A of the motor 23 and the rotation of the output shaft 25 </ b> A of the engine 25. Is transmitted to the front wheel 21.

  The front wheel 21 and the rear wheel 22 are each composed of two wheels paired in the vehicle width direction. In the present embodiment, the front wheels 21 are drive wheels for the motor 23 and the engine 25. The front wheel 21 and the rear wheel 22 are provided with a wheel speed sensor 21 </ b> A that detects the rotation amount of each wheel. Wheel speed sensor 21A transmits the detected value to ECU 70 described later. For convenience of illustration, FIG. 1 shows only one wheel speed sensor 21A.

The motor 23 is driven using the electric power stored in the battery 50, and outputs a rotational force (torque) from the output shaft 23A. This output drives the drive wheels of the vehicle. The motor 23 can also generate regenerative power using the regenerative force when the vehicle 10 is decelerated. The electric power generated by the regenerative power generation is supplied to the battery 50 via the inverter 24 and charges the battery 50.
That is, the motor 23 is a first rotating electrical machine that exchanges power with the battery 50.

  The inverter 24 adjusts the power supplied from the battery 50 in accordance with the driver's request and supplies it to the motor 23. As an example, the driver request is calculated by the ECU 70 (to be described later) from the depression force of the accelerator pedal and the depression force of the brake pedal. The ECU 70 controls the inverter 24 by designating the output torque and the rotational speed of the motor 23 based on the calculated output value required from the driver.

  The engine 25 is driven by burning the fuel supplied from the fuel tank 40 in the combustion chamber. The engine 25 is, for example, a reciprocating engine that uses gasoline as fuel. The driving of the engine 25 is controlled by an ECU 70 described later.

  The transmission mechanism 26 transmits the rotation of the output shaft 23 </ b> A of the motor 23 to the front wheel 21 and transmits the rotation of the output shaft 25 </ b> A of the engine 25 to the front wheel 21. The transmission mechanism 26 includes a clutch device 27. The clutch device 27 includes a pair of clutch plates 27A and 27B and a drive portion 27C that can contact the clutch plates 27A and 27B with each other and can release the contact state.

  The clutch plate 27A rotates integrally with the output shaft 25A of the engine 25. The clutch plate 27B rotates integrally with the output shaft 23A of the motor 23. When the clutch plates 27A and 27B come into contact with each other by the drive unit 27C, the clutch plates 27A and 27B rotate integrally with each other. As a result, the rotation of the output shaft 25A of the engine 25 is transmitted to the front wheels 21. When the clutch plates 27A and 27B are separated from each other by the drive unit 27C, the rotation of the output shaft 25A of the engine 25 is not transmitted to the front wheels 21. The drive unit 27C is controlled by an ECU 70 described later.

  The power generation system 30 is a mechanism for charging the battery 50, and includes an engine 25, a generator (second rotating electrical machine) 31, and an inverter 24.

The rotation shaft 31A of the generator 31 is driven by the second transmission mechanism 32 to transmit the rotation of the output shaft 25A of the engine 25, that is, driven by the engine. When the generator 31 is in a state capable of generating electric power under the control of the ECU 70, the rotating shaft 31A is rotated by receiving the rotation of the output shaft 25A of the engine 25 to generate power. The ECU 70 specifies the output torque and rotation speed of the generator 31 and controls the engine 25.
The generator 31 is connected to the inverter 24, and the AC power generated by the generator 31 is converted into DC power by the inverter 24 and charged to the battery 50. It is also possible to supply the electric power generated by the generator 31 directly to the motor 23.

  The generator 31 also functions as a starter when starting the engine 25. When starting the engine 25, the ECU 70 controls the inverter 24 to drive the generator 31. When the generator 31 is driven, the rotating shaft 31A rotates. Since the rotating shaft 31A is connected to the output shaft 25A of the engine 25 via the second transmission mechanism 32, when the generator 31 is driven and the rotating shaft 31A rotates, the output shaft 25A of the engine 25 rotates. Can do.

The battery 50 can also be charged by connecting an external charger (not shown) to the charging port 51 provided on the vehicle body of the vehicle 10 and receiving power supply.
Further, as described above, the battery 50 can be charged also by the electric power generated by the regenerative power generation of the motor 23.

  The fuel tank 40 accumulates fuel (for example, gasoline) that is a power source of the engine 25. In the fuel tank 40, a fuel sensor 40A for detecting the amount of accumulated fuel is provided. The fuel sensor 40A transmits the detected value to the ECU 70.

The battery 50 stores electric power that is a power source of the motor 23. A BMU (Battery Monitoring Unit) 51 is connected to the battery 50.
The BMU 51 includes a CPU, a ROM that stores and stores a battery control program, a charge rate calculation program, and the like, a RAM as an operation area of the program, an EEPROM that holds various data in a rewritable manner, an interface unit that interfaces with peripheral circuits, and the like It is comprised including.
The BMU 51 acquires detection values of a voltage sensor 52, a current sensor (current detection unit) 54 (see FIG. 2), a temperature sensor, and the like connected to the battery 50, and the voltage of the battery 50, input / output current, temperature, etc. Is detected. And the state of the battery 50 including a charge rate (SOC: State Of Charge) is detected.
In the present embodiment, the BMU 51 functions as the charging rate calculation device 80 (see FIG. 2).

  Like the BMU 51, the ECU 70 is configured to include a CPU, ROM, RAM, EEPROM, interface unit, and the like, and functions as a control unit that controls the entire vehicle 10.

The traveling mode of the vehicle 10 is appropriately switched by the ECU 70.
In the present embodiment, the vehicle 10 travels by appropriately switching the following three types of travel modes.
1. EV (Electric Vehicle) travel mode In this mode, the engine 25 stops and the vehicle 23 travels by rotating the axle with the driving force of the motor 23.
2. Series travel mode In this mode, the engine 31 is driven by the engine 25 while the axle is rotated by the driving force of the motor 23 while the generator 31 is driven.
The transition from the EV travel mode to the series travel mode is performed in the following cases, for example.
<Pattern 1>
The request from the driver is greater than or equal to a predetermined request threshold.
For example, when the driver greatly depresses the accelerator when he wants to accelerate. In this case, the electric power generated by the generator 31 is supplied to the motor 23 together with the electric power supplied from the battery 50. Thereby, the output of the motor 23 can be made larger than that in the EV traveling mode.
The request from the driver is, for example, a required output value, a required torque value, an electric energy necessary for generating the required output value, an accelerator opening degree, and the like. In the present embodiment, a request from the driver is determined using the requested output value. The required output value is a value calculated by a function for calculating a required output value using, for example, the accelerator opening (the amount of operation of the accelerator pedal) as a variable.
<Pattern 2>
When the charging rate of the battery 50 is equal to or lower than a predetermined charging threshold, the charging rate of the battery 50 is lowered, and there is a possibility that an electric shortage state may occur if the vehicle 50 travels as it is. In this case, the electric power generated by the generator 31 is supplied to the motor 23 and the surplus is supplied to the battery 50 and used for charging.
3. Parallel traveling mode In this mode, the vehicle is driven by rotating the axle with the driving force of the engine 25 and the driving force of the motor 23.
In particular, when the driving efficiency of the axle by the engine 25 is high, such as during high-speed driving, the mode is shifted to the parallel driving mode. Even in the parallel traveling mode, it is possible to generate power by transmitting the driving force of the engine 25 to the generator 31 (that is, to distribute the driving force of the engine 25 to traveling and power generation).

Next, the configuration of the charging rate calculation device 80 that calculates the charging rate of the battery 50 will be described.
FIG. 2 is a block diagram showing a functional configuration of the charging rate calculation device 80.
The charging rate calculation device 80 is realized by the BMU 51 executing the above charging rate calculation program, and includes a first power calculation unit 82, a second power calculation unit 84, a charging rate calculation unit 86, and an abnormality determination unit 88. .

Based on the current detected by current sensor 52, first power calculation unit 82 calculates a first power amount input / output to / from battery 50 (first integrated value I1 in the present embodiment).
The first power calculation unit 82 uses the detection values of the voltage sensor 52 and the current sensor 54 (current detection unit) connected to the battery 50 to each time t (predetermined time) as shown in the following equation (1). ) To calculate the amount of power W1 input to and output from the battery 50. In the following equation (1), V (t) is the output voltage [V] of the battery 50 at time t (predetermined time), A (t) is the output current [A] of the battery 50 at time t, W1 (t) The unit of is [kW].
Note that the output current A is used when the driving power is supplied from the battery 50 to the motor 23 (during discharging) and when the battery 50 is charged by the operation of the generator 31 or the regenerative power generation of the motor 23. The sign of (t) is reversed.

In addition, the first power calculation unit 82 integrates the power amount W1 at each time t for a predetermined period as shown in the following formula (2), and calculates a first integrated value I1 (first power amount). The predetermined period is a period until a change amount ΔS1 or ΔS2 (or integrated value I1 or I2) described later becomes equal to or greater than a second predetermined value (predetermined power value) X2. The unit of the integrated value I1 is [kWh].
That is, the first power calculation unit 82 multiplies the output voltage V (t) of the battery 50 at time t (predetermined time) and the output current A (t) of the battery 50 at time t (predetermined time). Is integrated for a predetermined period to calculate a first integrated value I1 (first electric energy).
Furthermore, in the present embodiment, the amount of change ΔS1 of the charging rate of the battery 50 in the predetermined period is calculated using the first integrated value I1 (first electric energy) as in the following formula (3). In the following formula (3), P is the usable electric energy [kWh] when the battery 50 is fully charged, and the unit of ΔS1 is [%]. Note that P may be a nominal capacity value of the battery 50.
In the present embodiment, it is assumed that ΔS1 becomes a negative value when the charging rate of the battery 50 decreases within a predetermined period, and ΔS1 becomes a positive value when it increases.

The second power calculation unit 84 is configured to output a second power amount input / output from the motor 23 (first rotating electrical machine) based on the operating state of the motor 23 (first rotating electrical machine) (in the present embodiment). The second integrated value I2) is calculated.
In the present embodiment, since the generator 31 is connected to the battery 50 and the motor 23, the second power calculation unit 84 uses the power amount Wb input / output to / from the motor 23 and the power output from the generator 31. A second power amount (second integrated amount I2) is calculated by integrating the sum with the amount Wg.
The second power calculation unit 84 acquires the output torque and rotation speed instruction values of the motor 23 at each time t from the ECU 70. In addition, the second power calculation unit 84 acquires the output torque and rotation speed instruction values of the generator 31 at each time t from the ECU 70.
Then, using the acquired output torque and rotation speed, the amount of electric power Wb input / output to / from the motor 23 and the amount of electric power Wg output from the generator 31 at each time t are calculated as in the following equation (4). To do.
In the following equation (4), Tm (t) is the output torque [Nm] of the motor 23 at time t, nm (t) is the rotation speed [rpm] of the motor 23 at time t, and Tg (t) is power generation at time t. The output torque [Nm] and ng (t) of the machine 31 are the rotational speed [rpm] of the generator 31 at time t, and the unit of Wb (t) and Wg (t) is [W].
In addition, the positive / negative of the said output torque Tm (t) is reversed by the case where the motor 23 is drive | working normally (electric power is used) and the case where regenerative electric power generation is carried out.
Moreover, when the output electric energy [W] is directly output from the motor 23 or the generator 31, the value may be set to Wb (t) and Wg (t).

Further, the second power calculation unit 84 integrates the sum of the power amounts Wb and Wg at each time t for a predetermined period as shown in the following formula (5), and the second integrated value I2 (second power amount) ) Is calculated. The predetermined period is a period until ΔS1 or ΔS2, which will be described later, becomes equal to or greater than a second predetermined value (predetermined power value) X2. The unit of the integrated value I2 is [kWh].
In the following formula (5), 2π / 60 is a coefficient for converting the rotational speed [rpm] to the angular velocity [rad / s].
That is, the second power calculation unit 84 outputs the output torque Tm (t) of the motor 23 at time t (predetermined time), the rotational speed nm (t) of the motor 23 at time t, and a predetermined coefficient (2π / 60). And the product of the output torque Tg (t) of the generator 31 (second rotating electrical machine) at time t, the rotational speed ng (t) of the generator 31 at time t, and the coefficient (2π / 60) Is integrated for a predetermined period to calculate a second integrated value I2 (second electric energy).

  Furthermore, in the present embodiment, a change amount ΔS2 is calculated by converting the second integrated value I2 into a percentage with respect to the capacity of the battery 50 (usable power amount at the time of full charge) as in the following formula (6). In the following formula (6), P is the usable electric energy [kWh] when the battery 50 is fully charged, and the unit of ΔS2 is [%]. Note that P may be a nominal capacity value of the battery 50.

The charging rate calculation unit 86 calculates the charging rate of the battery 50 based on the first integrated value I1.
The charging rate calculation unit 86, for example, sets the charging rate when charging to full charge by an external charger to 100%, and sequentially adds ΔS1 calculated by the first power calculation unit 82 to thereby increase the battery A charge rate of 50 is calculated.
The charging rate calculated by the charging rate calculation unit 86 is displayed on a display unit 90 provided at a position visible to the driver, such as an instrument panel. The ECU 70 is also used for vehicle control.

The abnormality determination unit 88 determines whether or not there is an abnormality in the charging rate based on the comparison result between the first electric energy and the second electric energy. In the present embodiment, abnormality determination unit 88 has a difference between first integrated value I1 (first electric energy) and second integrated value I2 (second electric energy) equal to or greater than first predetermined value X1. In this case, it is determined that there is an abnormality in the charging rate calculated by the charging rate calculation unit 86, that is, there is a possibility that some failure or abnormality has occurred.
In the present embodiment, it is determined whether the difference between the change amounts ΔS1 and ΔS2 calculated using the integrated values I1 and I2 is equal to or greater than the first predetermined value X1. Also in this case, since the change amounts ΔS1, ΔS2 are obtained by multiplying the integrated values I1, I2 by a constant (100 / P), respectively, the difference between the first integrated value I1 and the second integrated value I2 is substantially obtained. Is calculated.

That is, in the power system including the battery 50, the abnormality determination unit 88 and the integrated value (first integrated value I1) of the amount of power input / output to / from the battery 50 within a predetermined period and other devices (the present embodiment) Then, the integrated value (second integrated value I2) of the electric energy input / output to / from the motor 23 and the generator 31) is compared.
Theoretically, the first integrated value I1 and the second integrated value I2 should be equal. However, if the difference between the first integrated value I1 and the second integrated value I2 is large, some abnormality (failure or the like) is suspected, and the charge rate value calculated by the charge rate calculation unit 86 is inaccurate. There is a high possibility. Specific examples of abnormal (failure) locations include the voltage sensor 52, the current sensor 54, the ECU 70, and the like.
In particular, when the value of the charging rate is always calculated as a constant value due to a failure (fixed state), it is difficult to detect the failure as compared with the case where the value of the charging rate shows an abnormal value. According to the above method, it is possible to quickly detect a failure when the charging rate of the battery 50 is calculated to be a constant value even though power consumption or power generation is actually performed. .
In general, in the motor 23 and the generator 31, a loss occurs between the input power and the machine output (torque × rotational speed). The threshold (first predetermined value X1) is set taking this loss into account.

Here, the abnormality determination unit 88 calculates the difference when at least one of the first integrated value I1 and the second integrated value I2 becomes equal to or greater than a second predetermined value X2 (predetermined power value).
That is, in either the battery 50 or the motor 23 / generator 31, the integration is continued until the integrated value of the input and output electric power becomes equal to or greater than a predetermined amount (second predetermined value X2 or more), and the integrated value is constant. The difference is calculated at the timing when the amount is reached.
This is because the parameters (current, voltage, torque, and rotation speed) used when calculating the electric energy may contain errors. By continuing the integration for a certain period, the effects of the errors are averaged. ing. Factors of error include, for example, an error caused by the minimum number of digits of the sensor with respect to current and voltage, and an error between an instruction value (indicated torque value) of output torque acquired from the ECU 70 and an actual torque with respect to torque and rotation speed. Can be mentioned.
In the present embodiment, the difference is calculated when at least one of the change amounts ΔS1 or ΔS2 is equal to or greater than the second predetermined value X2.

The abnormality determination unit 88 determines that the first integrated value I1 (first power amount) is a second predetermined value (predetermined power value) X2 before the second integrated value I2 (second power amount). When it becomes above, you may determine with the sensor which measures the input / output amount of the electric power to the battery 50, especially the current sensor 54 (current detection part) having a possibility of characteristic abnormality.
The torque value used when calculating the second integrated value I2 is an instruction torque value acquired from the ECU 70. Generally, the instruction torque value is larger than the actual torque value. For this reason, normally, it is expected that the second integrated value I2 first becomes equal to or greater than the second predetermined value X2.
On the other hand, when the first integrated value I1 becomes equal to or greater than the second predetermined value X2 prior to the second integrated value I2, the current (or voltage) value is actually increased due to sensor characteristic abnormality. May be recognized as a larger value.
As described above, the failure can be detected depending on which of the integrated values I1 and I2 first exceeds the predetermined value.

Further, the abnormality determination unit 88 determines that the second integrated value I2 (second electric energy) integrated from a predetermined reference time is a third predetermined value (predetermined integrated value) X3 (<second predetermined value X2). On the other hand, when the first integrated value I1 (first electric energy) integrated from the reference time is 0 or a value close to 0, the charging rate calculated by the charging rate calculating unit 86 is It may be determined that there is an abnormality.
The predetermined reference time is, for example, when the traveling system 20 of the vehicle 10 is activated. Although it is detected that the motor 23 and the generator 31 have been operated after the driving system 20 of the vehicle 10 is activated (the second integrated value I2 is equal to or greater than the third predetermined value X3), When the input / output amount of power from the battery 50 is a value close to 0, there is a high possibility that the voltage sensor 52 or the current sensor 54 that detects data for calculating the input / output amount of power from the battery 50 is not functioning. .
In such a case, it may be determined that there is a possibility of failure without waiting for the second integrated value I2 to be equal to or greater than the second predetermined value X2.

  When the abnormality determination unit 88 determines that the charging rate calculated by the charging rate calculation unit 86 is abnormal, for example, the display unit 90 displays that there is a possibility of device failure. In addition, for example, a failure signal is output to the ECU 70, and the vehicle 10 is shifted to the control at failure.

FIG. 3 is a flowchart showing a processing procedure of the charging rate calculation device 80.
When the traveling system 20 is activated (ON) (step S300), the first power calculation unit 82 acquires the output voltage of the battery 50 from the voltage sensor 52 and the output current of the battery 50 from the current sensor 54 (step S302). The first power calculation unit 82 calculates the amount of power W1 input / output to / from the battery 50 using the output voltage and output current, integrates the values, and calculates the first integrated value I1 and the change amount ΔS1. (Step S304).
Further, the charging rate calculation unit 86 calculates the charging rate based on the first integrated value I1 (change amount ΔS) (step S306).

  Further, the second power calculation unit 84 acquires the output torque and rotation speed of the motor 23 and the generator 31 from the ECU 70 (step S308). The second power calculation unit 84 calculates the amount of power Wb input / output to / from the motor 23 and the amount of power Wg input / output to / from the generator 31 using the output torque and the rotational speed, and sums the sums. The second integrated value I2 and change amount ΔS2 are calculated (step S310).

  The abnormality determining unit 88 determines whether or not at least one of the change amount ΔS1 or ΔS2 is equal to or greater than the second predetermined value X2 (step S312). While neither change amount ΔS1 or ΔS2 becomes equal to or greater than the second predetermined value X2 (step S312: Yes), the first power calculator 82 and the second power calculator 84 return to step S302 or S308, respectively. Repeat the following process.

When at least one of the change amounts ΔS1 and ΔS2 becomes equal to or greater than the second predetermined value X2 (step S312: Yes), the abnormality determination unit 88 determines the absolute value of the difference between the change amounts ΔS1 and ΔS2 (| ΔS1−ΔS2). It is determined whether or not | is equal to or greater than a first predetermined value X1 (step S314).
When | ΔS1−ΔS2 | is less than the first predetermined value X1 (step S314: No), the abnormality determination unit 88 calculates the calculated values (ΔS1, S1 of the first power calculation unit 82 and the second power calculation unit 84). ΔS2, I1, I2, etc.) are cleared (step S316), and the first power calculator 82 and the second power calculator 84 return to step S302 or S308, respectively, and repeat the subsequent processing.
On the other hand, when | ΔS1−ΔS2 | is equal to or larger than the first predetermined value X1 (step S314: Yes), the abnormality determination unit 88 determines that there is a possibility of abnormality in the charging rate calculated in step S306 (step S314). S318). After that, the abnormality determination unit 88 performs processing such as notifying the possibility of failure using the display unit 90 or shifting the ECU 70 to control at the time of failure.

  As described above, the charging rate calculation device 80 according to the embodiment has an abnormality in the charging rate based on a comparison between the amount of power input / output to / from the battery and the amount of power input / output to / from the motor 23. It is determined whether or not. Thereby, for example, even when there is no opportunity to obtain a charge rate to be compared with the charge rate calculated by the charge rate calculating unit 86 based on input / output of power to the battery 50, the charge rate It can be determined whether there is any abnormality.

  In the present embodiment, the BMU 51 functions as the charging rate calculation device 80. However, the present invention is not limited to this. For example, the ECU 70 may function as the charging rate calculation device 80. Further, the function of the charging rate calculation device 80 may be realized by an information processing device other than the BMU 51 and the ECU 70.

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 20 ... Traveling system, 23 ... Motor (first rotating electrical machine), 30 ... Power generation system, 31 ... Generator (second rotating electrical machine), 50 ... Battery, 50A ... BMU, 52... Voltage sensor, 54... Current sensor (current detection unit), 80... Charging rate calculation device, 82... First power calculation unit, 84. Charging rate calculation unit, 88... Abnormality determination unit, 90.

Claims (6)

A charging rate calculation device that calculates a charging rate of a battery that exchanges power with a first rotating electrical machine mounted on a vehicle,
A current detection unit for detecting current input to and output from the battery;
A first power calculation unit that calculates a first power amount input to and output from the battery based on the current detected by the current detection unit;
A second power calculation unit that calculates a second power amount input / output from the first rotating electrical machine based on an operating state of the first rotating electrical machine;
An abnormality determination unit that determines whether or not the charging rate is abnormal based on a comparison result between the first electric energy and the second electric energy;
A charging rate calculation device comprising: The battery and the first rotating electrical machine are connected to a second rotating electrical machine that is driven by an engine to generate electric power,
The second power calculation unit calculates the second power amount by the sum of the power amount input / output to / from the first rotating electrical machine and the power amount input / output from the second rotating electrical machine,
The charging rate calculation apparatus according to claim 1. The first rotating electrical machine is a motor for driving the driving wheels of the vehicle;
The first power calculation unit calculates the first power amount by integrating a product of an output voltage of the battery at a predetermined time and an output current of the battery at the predetermined time for a predetermined period,
The second power calculation unit is configured to multiply the output torque of the motor at the predetermined time, the number of rotations of the motor at the predetermined time, and a predetermined coefficient, and the second rotating electric machine at the predetermined time. The second electric energy is calculated by integrating the sum of the output torque, the product of the rotation speed of the second rotating electrical machine at the predetermined time and the coefficient for the predetermined period,
The charging rate calculation apparatus according to claim 2. The abnormality determination unit calculates a difference between the first power amount and the second power amount when at least one of the first power amount and the second power amount becomes a predetermined power value or more. Calculate
When it is determined that the difference is equal to or greater than a predetermined power value, it is determined that the charging rate is abnormal.
The charging rate calculation apparatus according to any one of claims 1 to 3, wherein The abnormality determination unit determines that the current detection unit is abnormal when the first power amount becomes equal to or greater than the predetermined power value before the second power amount.
The charging rate calculation apparatus according to claim 4, wherein: The abnormality determination unit is configured such that the first electric energy accumulated from the reference time is 0 or near 0, while the second electric energy accumulated from the predetermined reference time is equal to or greater than a predetermined integrated value. If it is a value, it is determined that the charging rate is abnormal.
The charging rate calculation apparatus according to any one of claims 1 to 5, wherein

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